Gears and transmission
RC Ornithopter 2-Stage Compound Gearbox - Exploded Parts
- Bounding box
- 1046.5 × 56 × 40 mm
- Engine
- 3D Printing B-rep
- Parameters
- 33
- Published
- November 13, 2026
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The prompt
Design a 3D-printable 2-stage compound spur gear reduction gearbox (19.36:1 total ratio, Module 1.0, 20° pressure angle) for an RC ornithopter, driven by a top-mounted 1000 KV BLDC motor. Model every component as a separate, individual STL/part (housing halves, gears, shafts, and crank arms) rather than a single fused solid block. Gear Train: A 10T motor pinion meshing with a 44T/10T intermediate compound gear, driving a final 44T output gear with dual output crank arms for wing flapping. Shafts & Bores: Motor Shaft Hole (10T Pinion): 3.17 mm bore (standard for 1000 KV BLDC motors). Gear Shafts: 3 mm diameter carbon fiber or steel shafts for both the intermediate compound gear and the final output gear. Bearings & Housing Pockets: 11 mm outer diameter (OD) × 3 mm inner diameter (ID) × 4 mm width ball bearings (693ZZ), with 11.1 mm press-fit pockets in the split-box housing halves and 3 mm ID adapter bushings if using larger-bore bearings.
Parameters
| Name | Value | Range |
|---|---|---|
| Spacing between exploded parts | 110 mm | 80 – 200 |
| Housing width | 86 mm | 60 – 120 |
| Housing depth | 56 mm | 40 – 100 |
| Height of each housing half | 16 mm | 10 – 30 |
| Housing wall thickness | 2.5 mm | 1.2 – 5 |
| Floor/ceiling thickness | 4 mm | 2 – 8 |
| Corner radius | 4 mm | 1 – 10 |
| Bearing pocket diameter | 11.1 mm | 10 – 14 |
| Motor mount boss diameter | 24 mm | 15 – 40 |
| Motor mount boss height | 6 mm | 2 – 12 |
| Motor shaft clearance | 3.2 mm | 2 – 6 |
| Motor screw hole | 3.4 mm | 2 – 5 |
| Motor screw circle diameter | 17 mm | 10 – 30 |
| Gear module | 1 mm | 0.5 – 2 |
| Pressure angle | 20 deg | 14 – 30 |
| Motor pinion teeth | 10 mm | 8 – 20 |
| Large gear teeth | 44 mm | 20 – 80 |
| Gear face width | 8 mm | 4 – 15 |
| Compound gear total height | 16 mm | 10 – 30 |
| Gear shaft diameter | 3 mm | 2 – 5 |
| Motor pinion bore | 3.17 mm | 2 – 5 |
| Output gear hub diameter | 12 mm | 6 – 25 |
| Output gear hub height | 6 mm | 2 – 15 |
| Set screw hole diameter | 2.7 mm | 1.5 – 4 |
| Intermediate shaft length | 34 mm | 20 – 60 |
| Output shaft length | 40 mm | 20 – 80 |
| Crank arm overall length | 30 mm | 15 – 60 |
| Crank arm width | 8 mm | 4 – 16 |
| Crank arm thickness | 4 mm | 2 – 8 |
| Crank linkage hole | 3.2 mm | 2 – 6 |
| Bearing outer diameter | 11 mm | 8 – 20 |
| Bearing inner diameter | 3 mm | 2 – 8 |
| Bearing width | 4 mm | 2 – 10 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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